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kernel-fxtec-pro1x/arch/powerpc/kvm/booke_interrupts.S
Scott Wood b59049720d KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn 
This allows additional registers to be accessed by the guest
in PR-mode KVM without trapping.

SPRG4-7 are readable from userspace.  On booke, KVM will sync
these registers when it enters the guest, so that accesses from
guest userspace will work.  The guest kernel, OTOH, must consistently
use either the real registers or the shared area between exits.  This
also applies to the already-paravirted SPRG3.

On non-booke, it's not clear to what extent SPRG4-7 are supported
(they're not architected for book3s, but exist on at least some classic
chips).  They are copied in the get/set regs ioctls, but I do not see any
non-booke emulation.  I also do not see any syncing with real registers
(in PR-mode) including the user-readable SPRG3.  This patch should not
make that situation any worse.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
2012-03-05 14:52:26 +02:00

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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
* Copyright 2011 Freescale Semiconductor, Inc.
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#include <asm/ppc_asm.h>
#include <asm/kvm_asm.h>
#include <asm/reg.h>
#include <asm/mmu-44x.h>
#include <asm/page.h>
#include <asm/asm-offsets.h>
#define VCPU_GPR(n) (VCPU_GPRS + (n * 4))
/* The host stack layout: */
#define HOST_R1 0 /* Implied by stwu. */
#define HOST_CALLEE_LR 4
#define HOST_RUN 8
/* r2 is special: it holds 'current', and it made nonvolatile in the
* kernel with the -ffixed-r2 gcc option. */
#define HOST_R2 12
#define HOST_NV_GPRS 16
#define HOST_NV_GPR(n) (HOST_NV_GPRS + ((n - 14) * 4))
#define HOST_MIN_STACK_SIZE (HOST_NV_GPR(31) + 4)
#define HOST_STACK_SIZE (((HOST_MIN_STACK_SIZE + 15) / 16) * 16) /* Align. */
#define HOST_STACK_LR (HOST_STACK_SIZE + 4) /* In caller stack frame. */
#define NEED_INST_MASK ((1<<BOOKE_INTERRUPT_PROGRAM) | \
(1<<BOOKE_INTERRUPT_DTLB_MISS) | \
(1<<BOOKE_INTERRUPT_DEBUG))
#define NEED_DEAR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
(1<<BOOKE_INTERRUPT_DTLB_MISS))
#define NEED_ESR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
(1<<BOOKE_INTERRUPT_INST_STORAGE) | \
(1<<BOOKE_INTERRUPT_PROGRAM) | \
(1<<BOOKE_INTERRUPT_DTLB_MISS))
.macro KVM_HANDLER ivor_nr
_GLOBAL(kvmppc_handler_\ivor_nr)
/* Get pointer to vcpu and record exit number. */
mtspr SPRN_SPRG_WSCRATCH0, r4
mfspr r4, SPRN_SPRG_RVCPU
stw r5, VCPU_GPR(r5)(r4)
stw r6, VCPU_GPR(r6)(r4)
mfctr r5
lis r6, kvmppc_resume_host@h
stw r5, VCPU_CTR(r4)
li r5, \ivor_nr
ori r6, r6, kvmppc_resume_host@l
mtctr r6
bctr
.endm
_GLOBAL(kvmppc_handlers_start)
KVM_HANDLER BOOKE_INTERRUPT_CRITICAL
KVM_HANDLER BOOKE_INTERRUPT_MACHINE_CHECK
KVM_HANDLER BOOKE_INTERRUPT_DATA_STORAGE
KVM_HANDLER BOOKE_INTERRUPT_INST_STORAGE
KVM_HANDLER BOOKE_INTERRUPT_EXTERNAL
KVM_HANDLER BOOKE_INTERRUPT_ALIGNMENT
KVM_HANDLER BOOKE_INTERRUPT_PROGRAM
KVM_HANDLER BOOKE_INTERRUPT_FP_UNAVAIL
KVM_HANDLER BOOKE_INTERRUPT_SYSCALL
KVM_HANDLER BOOKE_INTERRUPT_AP_UNAVAIL
KVM_HANDLER BOOKE_INTERRUPT_DECREMENTER
KVM_HANDLER BOOKE_INTERRUPT_FIT
KVM_HANDLER BOOKE_INTERRUPT_WATCHDOG
KVM_HANDLER BOOKE_INTERRUPT_DTLB_MISS
KVM_HANDLER BOOKE_INTERRUPT_ITLB_MISS
KVM_HANDLER BOOKE_INTERRUPT_DEBUG
KVM_HANDLER BOOKE_INTERRUPT_SPE_UNAVAIL
KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_DATA
KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_ROUND
_GLOBAL(kvmppc_handler_len)
.long kvmppc_handler_1 - kvmppc_handler_0
/* Registers:
* SPRG_SCRATCH0: guest r4
* r4: vcpu pointer
* r5: KVM exit number
*/
_GLOBAL(kvmppc_resume_host)
stw r3, VCPU_GPR(r3)(r4)
mfcr r3
stw r3, VCPU_CR(r4)
stw r7, VCPU_GPR(r7)(r4)
stw r8, VCPU_GPR(r8)(r4)
stw r9, VCPU_GPR(r9)(r4)
li r6, 1
slw r6, r6, r5
#ifdef CONFIG_KVM_EXIT_TIMING
/* save exit time */
1:
mfspr r7, SPRN_TBRU
mfspr r8, SPRN_TBRL
mfspr r9, SPRN_TBRU
cmpw r9, r7
bne 1b
stw r8, VCPU_TIMING_EXIT_TBL(r4)
stw r9, VCPU_TIMING_EXIT_TBU(r4)
#endif
/* Save the faulting instruction and all GPRs for emulation. */
andi. r7, r6, NEED_INST_MASK
beq ..skip_inst_copy
mfspr r9, SPRN_SRR0
mfmsr r8
ori r7, r8, MSR_DS
mtmsr r7
isync
lwz r9, 0(r9)
mtmsr r8
isync
stw r9, VCPU_LAST_INST(r4)
stw r15, VCPU_GPR(r15)(r4)
stw r16, VCPU_GPR(r16)(r4)
stw r17, VCPU_GPR(r17)(r4)
stw r18, VCPU_GPR(r18)(r4)
stw r19, VCPU_GPR(r19)(r4)
stw r20, VCPU_GPR(r20)(r4)
stw r21, VCPU_GPR(r21)(r4)
stw r22, VCPU_GPR(r22)(r4)
stw r23, VCPU_GPR(r23)(r4)
stw r24, VCPU_GPR(r24)(r4)
stw r25, VCPU_GPR(r25)(r4)
stw r26, VCPU_GPR(r26)(r4)
stw r27, VCPU_GPR(r27)(r4)
stw r28, VCPU_GPR(r28)(r4)
stw r29, VCPU_GPR(r29)(r4)
stw r30, VCPU_GPR(r30)(r4)
stw r31, VCPU_GPR(r31)(r4)
..skip_inst_copy:
/* Also grab DEAR and ESR before the host can clobber them. */
andi. r7, r6, NEED_DEAR_MASK
beq ..skip_dear
mfspr r9, SPRN_DEAR
stw r9, VCPU_FAULT_DEAR(r4)
..skip_dear:
andi. r7, r6, NEED_ESR_MASK
beq ..skip_esr
mfspr r9, SPRN_ESR
stw r9, VCPU_FAULT_ESR(r4)
..skip_esr:
/* Save remaining volatile guest register state to vcpu. */
stw r0, VCPU_GPR(r0)(r4)
stw r1, VCPU_GPR(r1)(r4)
stw r2, VCPU_GPR(r2)(r4)
stw r10, VCPU_GPR(r10)(r4)
stw r11, VCPU_GPR(r11)(r4)
stw r12, VCPU_GPR(r12)(r4)
stw r13, VCPU_GPR(r13)(r4)
stw r14, VCPU_GPR(r14)(r4) /* We need a NV GPR below. */
mflr r3
stw r3, VCPU_LR(r4)
mfxer r3
stw r3, VCPU_XER(r4)
mfspr r3, SPRN_SPRG_RSCRATCH0
stw r3, VCPU_GPR(r4)(r4)
mfspr r3, SPRN_SRR0
stw r3, VCPU_PC(r4)
/* Restore host stack pointer and PID before IVPR, since the host
* exception handlers use them. */
lwz r1, VCPU_HOST_STACK(r4)
lwz r3, VCPU_HOST_PID(r4)
mtspr SPRN_PID, r3
#ifdef CONFIG_FSL_BOOKE
/* we cheat and know that Linux doesn't use PID1 which is always 0 */
lis r3, 0
mtspr SPRN_PID1, r3
#endif
/* Restore host IVPR before re-enabling interrupts. We cheat and know
* that Linux IVPR is always 0xc0000000. */
lis r3, 0xc000
mtspr SPRN_IVPR, r3
/* Switch to kernel stack and jump to handler. */
LOAD_REG_ADDR(r3, kvmppc_handle_exit)
mtctr r3
lwz r3, HOST_RUN(r1)
lwz r2, HOST_R2(r1)
mr r14, r4 /* Save vcpu pointer. */
bctrl /* kvmppc_handle_exit() */
/* Restore vcpu pointer and the nonvolatiles we used. */
mr r4, r14
lwz r14, VCPU_GPR(r14)(r4)
/* Sometimes instruction emulation must restore complete GPR state. */
andi. r5, r3, RESUME_FLAG_NV
beq ..skip_nv_load
lwz r15, VCPU_GPR(r15)(r4)
lwz r16, VCPU_GPR(r16)(r4)
lwz r17, VCPU_GPR(r17)(r4)
lwz r18, VCPU_GPR(r18)(r4)
lwz r19, VCPU_GPR(r19)(r4)
lwz r20, VCPU_GPR(r20)(r4)
lwz r21, VCPU_GPR(r21)(r4)
lwz r22, VCPU_GPR(r22)(r4)
lwz r23, VCPU_GPR(r23)(r4)
lwz r24, VCPU_GPR(r24)(r4)
lwz r25, VCPU_GPR(r25)(r4)
lwz r26, VCPU_GPR(r26)(r4)
lwz r27, VCPU_GPR(r27)(r4)
lwz r28, VCPU_GPR(r28)(r4)
lwz r29, VCPU_GPR(r29)(r4)
lwz r30, VCPU_GPR(r30)(r4)
lwz r31, VCPU_GPR(r31)(r4)
..skip_nv_load:
/* Should we return to the guest? */
andi. r5, r3, RESUME_FLAG_HOST
beq lightweight_exit
srawi r3, r3, 2 /* Shift -ERR back down. */
heavyweight_exit:
/* Not returning to guest. */
#ifdef CONFIG_SPE
/* save guest SPEFSCR and load host SPEFSCR */
mfspr r9, SPRN_SPEFSCR
stw r9, VCPU_SPEFSCR(r4)
lwz r9, VCPU_HOST_SPEFSCR(r4)
mtspr SPRN_SPEFSCR, r9
#endif
/* We already saved guest volatile register state; now save the
* non-volatiles. */
stw r15, VCPU_GPR(r15)(r4)
stw r16, VCPU_GPR(r16)(r4)
stw r17, VCPU_GPR(r17)(r4)
stw r18, VCPU_GPR(r18)(r4)
stw r19, VCPU_GPR(r19)(r4)
stw r20, VCPU_GPR(r20)(r4)
stw r21, VCPU_GPR(r21)(r4)
stw r22, VCPU_GPR(r22)(r4)
stw r23, VCPU_GPR(r23)(r4)
stw r24, VCPU_GPR(r24)(r4)
stw r25, VCPU_GPR(r25)(r4)
stw r26, VCPU_GPR(r26)(r4)
stw r27, VCPU_GPR(r27)(r4)
stw r28, VCPU_GPR(r28)(r4)
stw r29, VCPU_GPR(r29)(r4)
stw r30, VCPU_GPR(r30)(r4)
stw r31, VCPU_GPR(r31)(r4)
/* Load host non-volatile register state from host stack. */
lwz r14, HOST_NV_GPR(r14)(r1)
lwz r15, HOST_NV_GPR(r15)(r1)
lwz r16, HOST_NV_GPR(r16)(r1)
lwz r17, HOST_NV_GPR(r17)(r1)
lwz r18, HOST_NV_GPR(r18)(r1)
lwz r19, HOST_NV_GPR(r19)(r1)
lwz r20, HOST_NV_GPR(r20)(r1)
lwz r21, HOST_NV_GPR(r21)(r1)
lwz r22, HOST_NV_GPR(r22)(r1)
lwz r23, HOST_NV_GPR(r23)(r1)
lwz r24, HOST_NV_GPR(r24)(r1)
lwz r25, HOST_NV_GPR(r25)(r1)
lwz r26, HOST_NV_GPR(r26)(r1)
lwz r27, HOST_NV_GPR(r27)(r1)
lwz r28, HOST_NV_GPR(r28)(r1)
lwz r29, HOST_NV_GPR(r29)(r1)
lwz r30, HOST_NV_GPR(r30)(r1)
lwz r31, HOST_NV_GPR(r31)(r1)
/* Return to kvm_vcpu_run(). */
lwz r4, HOST_STACK_LR(r1)
addi r1, r1, HOST_STACK_SIZE
mtlr r4
/* r3 still contains the return code from kvmppc_handle_exit(). */
blr
/* Registers:
* r3: kvm_run pointer
* r4: vcpu pointer
*/
_GLOBAL(__kvmppc_vcpu_run)
stwu r1, -HOST_STACK_SIZE(r1)
stw r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */
/* Save host state to stack. */
stw r3, HOST_RUN(r1)
mflr r3
stw r3, HOST_STACK_LR(r1)
/* Save host non-volatile register state to stack. */
stw r14, HOST_NV_GPR(r14)(r1)
stw r15, HOST_NV_GPR(r15)(r1)
stw r16, HOST_NV_GPR(r16)(r1)
stw r17, HOST_NV_GPR(r17)(r1)
stw r18, HOST_NV_GPR(r18)(r1)
stw r19, HOST_NV_GPR(r19)(r1)
stw r20, HOST_NV_GPR(r20)(r1)
stw r21, HOST_NV_GPR(r21)(r1)
stw r22, HOST_NV_GPR(r22)(r1)
stw r23, HOST_NV_GPR(r23)(r1)
stw r24, HOST_NV_GPR(r24)(r1)
stw r25, HOST_NV_GPR(r25)(r1)
stw r26, HOST_NV_GPR(r26)(r1)
stw r27, HOST_NV_GPR(r27)(r1)
stw r28, HOST_NV_GPR(r28)(r1)
stw r29, HOST_NV_GPR(r29)(r1)
stw r30, HOST_NV_GPR(r30)(r1)
stw r31, HOST_NV_GPR(r31)(r1)
/* Load guest non-volatiles. */
lwz r14, VCPU_GPR(r14)(r4)
lwz r15, VCPU_GPR(r15)(r4)
lwz r16, VCPU_GPR(r16)(r4)
lwz r17, VCPU_GPR(r17)(r4)
lwz r18, VCPU_GPR(r18)(r4)
lwz r19, VCPU_GPR(r19)(r4)
lwz r20, VCPU_GPR(r20)(r4)
lwz r21, VCPU_GPR(r21)(r4)
lwz r22, VCPU_GPR(r22)(r4)
lwz r23, VCPU_GPR(r23)(r4)
lwz r24, VCPU_GPR(r24)(r4)
lwz r25, VCPU_GPR(r25)(r4)
lwz r26, VCPU_GPR(r26)(r4)
lwz r27, VCPU_GPR(r27)(r4)
lwz r28, VCPU_GPR(r28)(r4)
lwz r29, VCPU_GPR(r29)(r4)
lwz r30, VCPU_GPR(r30)(r4)
lwz r31, VCPU_GPR(r31)(r4)
#ifdef CONFIG_SPE
/* save host SPEFSCR and load guest SPEFSCR */
mfspr r3, SPRN_SPEFSCR
stw r3, VCPU_HOST_SPEFSCR(r4)
lwz r3, VCPU_SPEFSCR(r4)
mtspr SPRN_SPEFSCR, r3
#endif
lightweight_exit:
stw r2, HOST_R2(r1)
mfspr r3, SPRN_PID
stw r3, VCPU_HOST_PID(r4)
lwz r3, VCPU_SHADOW_PID(r4)
mtspr SPRN_PID, r3
#ifdef CONFIG_FSL_BOOKE
lwz r3, VCPU_SHADOW_PID1(r4)
mtspr SPRN_PID1, r3
#endif
#ifdef CONFIG_44x
iccci 0, 0 /* XXX hack */
#endif
/* Load some guest volatiles. */
lwz r0, VCPU_GPR(r0)(r4)
lwz r2, VCPU_GPR(r2)(r4)
lwz r9, VCPU_GPR(r9)(r4)
lwz r10, VCPU_GPR(r10)(r4)
lwz r11, VCPU_GPR(r11)(r4)
lwz r12, VCPU_GPR(r12)(r4)
lwz r13, VCPU_GPR(r13)(r4)
lwz r3, VCPU_LR(r4)
mtlr r3
lwz r3, VCPU_XER(r4)
mtxer r3
/* Switch the IVPR. XXX If we take a TLB miss after this we're screwed,
* so how do we make sure vcpu won't fault? */
lis r8, kvmppc_booke_handlers@ha
lwz r8, kvmppc_booke_handlers@l(r8)
mtspr SPRN_IVPR, r8
/* Save vcpu pointer for the exception handlers. */
mtspr SPRN_SPRG_WVCPU, r4
lwz r5, VCPU_SHARED(r4)
/* Can't switch the stack pointer until after IVPR is switched,
* because host interrupt handlers would get confused. */
lwz r1, VCPU_GPR(r1)(r4)
/*
* Host interrupt handlers may have clobbered these
* guest-readable SPRGs, or the guest kernel may have
* written directly to the shared area, so we
* need to reload them here with the guest's values.
*/
lwz r3, VCPU_SHARED_SPRG4(r5)
mtspr SPRN_SPRG4W, r3
lwz r3, VCPU_SHARED_SPRG5(r5)
mtspr SPRN_SPRG5W, r3
lwz r3, VCPU_SHARED_SPRG6(r5)
mtspr SPRN_SPRG6W, r3
lwz r3, VCPU_SHARED_SPRG7(r5)
mtspr SPRN_SPRG7W, r3
#ifdef CONFIG_KVM_EXIT_TIMING
/* save enter time */
1:
mfspr r6, SPRN_TBRU
mfspr r7, SPRN_TBRL
mfspr r8, SPRN_TBRU
cmpw r8, r6
bne 1b
stw r7, VCPU_TIMING_LAST_ENTER_TBL(r4)
stw r8, VCPU_TIMING_LAST_ENTER_TBU(r4)
#endif
/* Finish loading guest volatiles and jump to guest. */
lwz r3, VCPU_CTR(r4)
lwz r5, VCPU_CR(r4)
lwz r6, VCPU_PC(r4)
lwz r7, VCPU_SHADOW_MSR(r4)
mtctr r3
mtcr r5
mtsrr0 r6
mtsrr1 r7
lwz r5, VCPU_GPR(r5)(r4)
lwz r6, VCPU_GPR(r6)(r4)
lwz r7, VCPU_GPR(r7)(r4)
lwz r8, VCPU_GPR(r8)(r4)
/* Clear any debug events which occurred since we disabled MSR[DE].
* XXX This gives us a 3-instruction window in which a breakpoint
* intended for guest context could fire in the host instead. */
lis r3, 0xffff
ori r3, r3, 0xffff
mtspr SPRN_DBSR, r3
lwz r3, VCPU_GPR(r3)(r4)
lwz r4, VCPU_GPR(r4)(r4)
rfi
#ifdef CONFIG_SPE
_GLOBAL(kvmppc_save_guest_spe)
cmpi 0,r3,0
beqlr-
SAVE_32EVRS(0, r4, r3, VCPU_EVR)
evxor evr6, evr6, evr6
evmwumiaa evr6, evr6, evr6
li r4,VCPU_ACC
evstddx evr6, r4, r3 /* save acc */
blr
_GLOBAL(kvmppc_load_guest_spe)
cmpi 0,r3,0
beqlr-
li r4,VCPU_ACC
evlddx evr6,r4,r3
evmra evr6,evr6 /* load acc */
REST_32EVRS(0, r4, r3, VCPU_EVR)
blr
#endif
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